The Story of Risk in the
Hundred Acre Wood
One can draw parallels by looking at the
characters in the Winnie the Pooh stories. Some
people are Piglets who worry, worry, worry and
want to take no risks whatsoever. Others are
Eyores who are gloomy and resigned to the worst
possible thing happening, so why fight it. And then
some are utterly confident and wise in their view
that everything is under control and that nothing
bad could possibly happen in their organization –
clearly Owl – until their house blows down.

Spur gears are used to transmit rotary motion between parallel shafts. They are cylindrical, and the teeth are straight and parallel to the axis of rotation. The pinion is the smaller of two mating gears; the larger is called the gear or the wheel. The pitch circle, B in Fig. 33.1, is a theoretical circle upon which all calculations are based. The operating pitch circles of a pair of gears in mesh are tangent to each other.

CHAPTER 33
SPUR GEARS
Joseph E. Shigley Professor Emeritus The University of Michigan Ann Arbor, Michigan
33.1 33.2 33.3 33.4
DEFINITIONS / 33.1 TOOTH DIMENSIONS AND STANDARDS / 33.4 FORCE ANALYSIS / 33.5 FUNDAMENTAL AGMA RATING FORMULAS / 33.6
33.7
DEFINITIONS
Spur gears are used to transmit rotary motion between parallel shafts. They are cylindrical, and the teeth are straight and parallel to the axis of rotation. The pinion is the smaller of two mating gears; the larger is called the gear or the wheel. The pitch circle, B in Fig. 33.